Screening device



SCREENING DEVICE Filed Sept. 8. 1922 for its principal cbjects to deviser' sists in the parts and f numerals indica-te like Patented @et 30,1923.

unirse stares CLARENCE J. SNIDOE, OF ST. LOUIS, MISSOUR.

SCREENING DEVICE.

application inea september s, 192e.

To allV 'LU/tom. may concern.:

Be it known that l, CLARnNcr. J. lSlANnon, a citizen of the UnitedStates, resident of the city of St. Louis, State of Missouri, haveinvented a certain new and useful improvement in Screening Devices, ofwhich the following is a specification.

My invention relates to screening devices such as are used in screeningcoal and has a simple and easily operable device that will rapidly,econcmically7 and accurately separate the liner materials from the largeand that will also feed the large materials toward a point of delivery.

The invention consists mounting' two independent sets of screen bars sothat they are movable up and down and also back and forth, the motion ofone set of bars being opposite to that of the other. The inventionfurther consists in mounting screen bars in such way that they are given`a combined vertical and longitudinal movement. The invention furtherconcombinations and arparts hereinafter described principally inrangements of and claimed.

In the drawings which form part of this specification and wherein likereference parts wherever they occur,

Fig. 1 is a side elevation of a screening mechanism embodying` myinvention;

Fig. 2 is a top plan view thereof; and

Fig. 3 is an end elevation thereof.

Mounted at one end in bearings on a support 11 of wood or other suitablematerial and atthe other end in similar bearings 10 on a similar butpreferably shorter support 12 are shafts 18. Fixed on said shafts 13 torock therewith secured to one end of each of said arms 14 is a rod 15and pivotally secured to the other end of each of said arms is a similarrod 16. Secured to the lower ends of said rods 15 are bars 17 that areprovided with upstanding members 18 to which are secured screen bars 19as by rivets 20.

Secured to the ends of the other hanger rods 16 are bars 21 that areprovided with upstanding` members 22 to which are secured screen bars23l as by rivets 24. Thus, the device comprises two sets of shaker bars19, 23 that are mounted on suitable frames independent of each other.

Mounted in journal bearings 25 on supare arms 14. Pivotallyy Serial No.536,881.

ports 26 is a crank shaft 27 that is provided at one end with a pulley28 that may be con nested withv any suitable source of power. fit eachend the crank shaft 2'? is provided. with oppositely disposed crank arms29. @ne of said crank arms 29 is connected with the bar 17 that supportsone set of shaker bars 19 and the other crank arm 29 is connected withthe bar 21 on which are mounted the ther shaker bars 28. Thus, 4as thecrank shaft rotates said shaker bars are given a backward and forwardmovement, one set moving forward and the other set moving backward. Thecrank shaft 27 is also provided with a crank arm 30 to which is securedan upstanding' crank rod 81. The upper end of the crank rod Ill ispivotally secured to one arm of a. bent lever 32 that is pivotallymounted on a block 33 secured to the support 12. Pivotally secured tothe other arm of said bent lever 32 is a rod 34 that extends lengthwiseof the device and is pivotally connected to short links 35 that arefixed on the rock shafts 13. Thus, as the crank shaft rotates the rotarymotion thereof is converted by the mechanism above described into arocking movement of the shafts 13. The rocking of the shafts 13, inturn, is converted into an up and down movement of the respective setsof shaker bars.

It will be seen that each set of shaker bars is always subject to twoforces, one operated by the crank arms tending to move the rods forwardor backward and the other, operated through the crank rod and itsconnections, tending to move the bars up or down, the resulting movementis, of course, a combined forward and upward or downward and backwardmovement, one set of barsmoving in one direction while the other set ismoving in the other direction.

The screening mechanism above described feeds the heavy pieces forwardat the same time that it is separating out the finer pieces.

he materials being screened are thoroughly agitated and the fineparticles are screened out. The screening devices may be used in seriesif desired. one set feeding to the other.

Obviously, numerous changes may be made without departing from myinvention and I do not wish to be limited te the precise constructionshown.

at I claim is: 1. A screeningdevice comprising a support, two sets ofelongated hangers suspended therefrom in such manner that their endwise,said means being adapted to move the bars ofone set oppositelyrelatively to the movement of the bars of the other set.

2. A screening device comprising' two sets of parallel bars, cross-barssecured beneath. said screen bars rto hold them together, hanger rodspivotally secured to said crossbars and having their upper endspivotally secured to the ends of rocker arms, means for working saidarms to cause up and down movement of said hanger rods and screen harsand means for simultaneously moving said cross-bars and said` screenbars forward and backward. c

3. A screening apparatus comprising two sets of parallel screen bars,cross-bars secured beneath said screen bars to hold them1 together, apair of rock shafts disposed abovethe screen bars, arms secured tosaid.- shafts, hanger rods nivo-tally secured to said.

arms and t0 said cross-bars, the rods on one.

side of the shafts being connected to one set ofcross-b-ars and the rodson the other side being connected to theother set, and means for rockingsaid shafts together, to raise and lower the screen bars and means forlsimultaneously moving the screen bars forward and backward. Y i

lt. A screwing` apparatus comp-rising; two sets of parallel screen hars,cross-bars secured beneath saidscreen barsv to hold them together, apair of `rock shafts disposed above the screen bars, arms secured tosaid shafts, hanger rods p-ivot'ally secured to said arms and to saidcross-hais, the rods on-one side of the shafts being connected to oneset of cross-bars and the rods von the other side Y being connected totheother set, and incansfor rocking said shafts together, to raise andlower the screen .bars and means, for simultaneouslj)T moving' thescreen bars forward and backward said means comprising a crank shaft`*having a. crank arm operativelj)7 connected with said rock shafts andhaving crank arms disposed at anV angle of 180 degrees with each otherand'operativel)T connected respectively with said sets of screen bars.

Signed at St. Louis, Mo., vthis 6th day of September, 1922.

l v CLARENCE JfSVANDOE.

